Kuo's Group

Citation:

Tsai, M-K, Kuo J-L, Lu J-M.  2012.  The dynamics and spectroscopic fingerprint of hydroxyl radical generation through water dimer ionization: ab initio molecular dynamic simulation study. Phys. Chem. Chem. Phys.. 14:13402-13408.: The Royal Society of Chemistry

Abstract:

Water decomposition process was investigated by ab initio molecular dynamic simulations using a model of (H2O)2+ clusters. The proton transfer (PT) process from the cationic H-donor water to the H-acceptor water for the formation of (HO[radical dot])[middle dot]H3O+ was predicted as about 90 fs on average calculated at CCSD level of theory. The valence-electron transfer (VET) process through the formation of hemibond interaction between neutral and cationic water{,} (H2O)2+{,} was also identified in several collected trajectories. Both PT and VET processes were found to propagate along two orthogonal reaction coordinates{,} the former was through an intermolecular hydrogen bond and the latter required oxygen-oxygen hemibonding. Significant difference of the theoretical electronic transitions along the VET trajectories was also observed in comparison with the non-VET cases{,} being calculated at SAC-CI level. The strong absorption features of hemibonding (H2O)2+ may introduce an interesting consideration for experimental design to monitor the water decomposition process.

Notes:

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